เรื่องการ Sum ครับ รบกวนนิดครับ พอดีว่า เขียน Code เป็น Sum โปรแกรมไม่ทำงาน

 // Make a MySQL Connection  
$query = "SELECT comcs , SUM(comcs) As Sumcomcs  FROM customer";
$result = mysql_query($query) or die(mysql_error());
$row = mysql_fetch_array($result);
echo $row["Sumcomcs"];

// Make a MySQL Connection  
$query = "SELECT comcs , SUM(comcs) As Sumcomcs1  FROM customer "
;$result = mysql_query($query) or die(mysql_error());
$row = mysql_fetch_array($result);
echo $row["Sumcomcs1"];
echo '.$Sumcomcs.'+'.$Sumcomcs1.'.$Sumcomcs+$Sumcomcs1;
?>

 $query = "SELECT comcs FROM customer WHERE id = '1' "; 
$result = mysql_query($query) or die(mysql_error());
$row = mysql_fetch_array($result);
$Computer = $row["Computer"];

// Make a MySQL Connection  
$query = "SELECT comcs , count(comcs) As Sumcomcs1  FROM customer "
;$result = mysql_query($query) or die(mysql_error());
$row = mysql_fetch_array($result);
echo $row["Sumcomcs1"];
echo '.$Computer.'+'.$Sumcomcs1.'.$Computer+$Sumcomcs1;
?>